Sika® Watertight Concrete Powder
Sika® Watertight Concrete Powder is a combined water-resisting and HRWR/Superplasticizing admixture used to enhance the workability and reduce the water permeability of concrete. When added to concrete, the HRWR component in the admixture allows for the reduction in the water-cementitious ratio and reduces the large capillary pores in the concrete; the pore blocking component blocks the remaining small capillary pores by forming a hydrophobic layer within the pores.
- Reduces water absorption
- Reduces water penetration
Usage
Sika® Watertight Concrete Powder has been specifically formulated to produce high quality watertight concrete. Typical applications include:- Water retaining structures
- Below ground structures
- Residential foundations
- Swimming pools
- Lift pits
- Tunnels, etc.
Advantages
- Reduces water absorption
- Reduces water penetration
Packaging
1.34 kg (2.95 lb) water soluble bags, in boxes of 10
Colour
White powder
Product Details
APPROVALS / CERTIFICATES
Sika® Watertight Concrete Powder meets requirements of ASTM C494 Type F, ASTM C494 Type S and is ANSI/NSF 61 certified.
Shelf Life
2 years when stored in original, unopened packaging, in dry warehouse conditions at temperatures between 5 and 27 °C (40 and 80 °F). Protect from moisture.
Storage Conditions
Store at temperatures above 5 °C (40 °F). Protect from direct sunlight.
Application
Mixing
Truck mixers should be free from all contaminants prior to the batching of concrete containing Sika® Watertight Concrete Powder.
- Sika® Watertight Concrete Powder should be added to the mixer at the recommended dose.
- Batched concrete mix constituents should be subsequently batched on to the Sika® Watertight Concrete Powder.
- Additional mixing water should then be dispensed to bring the concrete to the desired consistency.
- Upon completion of the batching procedure, the concrete load should be mixed in the truck mixer on full revolutions for a minimum of five (5) minutes to ensure that the optimum consistency has been achieved.
- The w/c ratio and consistency control are the responsibility of the concrete producer. Laboratory trials are recommended to evaluate and confirm the actual water reduction.
Combination with Other Admixtures: Sika® Watertight Concrete Powder is compatible with other Sika admixtures. All admixtures should be added separately to the concrete mix. Contact your local Sika Canada Technical Sales Representative for further information.
Combination with Pozzolanic Materials: Sika® Watertight Concrete Powder can be successfully used in mix designs utilizing pozzolanic materials such as silica fume, fly ash and GGBFS.
Concrete Mix Design: Depending on the mix design, water reductions typically between 10 - 16 % can be achieved. Laboratory trials are always recommended to evaluate and confirm actual water reduction. Should the addition of a HRWR/Superplasticizer be required, it is recommended that a Sika® ViscoCrete® HRWR/Superplasticizer be selected. Contact your local Sika Canada Technical Sales Representative for further information.
Note: Results may vary with different materials, temperature conditions and testing practices.
350 kg/m3 (590 lb/yd3) of Cement Content (Type GU)
Admixture | Dosage | W/cm Ratio | Cement Content kg/m3 | Slump |
Control | - | 0.50 | 350 | 110 mm (4.5") |
Sika® Watertight Concrete Powder | 1.75 kg/m3 | 0.42 | 350 | 110 mm (4.5") |
Admixture | Compressive Strength | Compressive Strength | Water Reduction % |
7 days MPa | 28 days MPa | ||
Control | 28.6 | 43.1 | - |
Sika® Watertight Concrete Powder | 52.1 | 60.2 | 16 |
400 kg/m3 (675 lb/yd3) of Cement Content (Type GU)
Admixture | Dosage | W/cm Ratio | Cement Content kg/m3 | Slump |
Control | - | 0.46 | 400 | 125 mm (5") |
Sika® Watertight Concrete Powder | 1.75 kg/m3 | 0.42 | 400 | 125 mm (5") |
Admixture | Compressive Strength | Compressive Strength | Water Reduction % |
7 days MPa | 28 days MPa | ||
Control | 53.1 | 48.0 | - |
Sika® Watertight Concrete Powder | 57.4 | 60.9 | 16 |
Recommended Dosage
The recommended dosage of Sika® Watertight Concrete Powder is
1.75 kg/m3 of concrete material. In the event of part loads of less than one (1) cubic metre, it is recommended that a one cubic meter dose (1.75 kg/m3) of Sika® Watertight Concrete Powder be used. Contact your Sika Canada Technical Sales Representative for further information.